Reconfigurable optical add/drop multiplexer (OADM), which is the fundamental element of wavelength division
multiplexing (DWDM) system, employs various waveguide filter approaches. However, most of them are incapable of
dropping more than a single channel at one time. Therefore, an electro-optically tunable reconfigurable OADM with Ti:
LiNbO3 waveguide was designed and analyzed. The two electrodes layers, separated by silicon dioxide buffer, applied
two orthogonal electrodes fields in the waveguides which induced the wavelength dependent polarization conversion and
phase shifted respectively, and hence realized the add or drop function combining with two identical polarization beam
splitter waveguides. Profiting from the two layered electrodes structure, the tuning range was enlarged twice as the
original filter design. The multiple channels download is feasible due to the novel structure of the polarization
conversion electrodes.
A novel rapidly tunable, low loss, low crosstalk, polarization-independent, four-port reconfigurable optical add/drop multiplexer (OADM) is designed in this article. Electrooptic effect is used in two directions on waveguides which are fabricated on a LiNbO3 substrate by Ti diffusion in order to convert the polarization between TE and TM mode at the download or upload wavelength. Particularly, voltages applied along propagation direction are separated and can be well programmed to suppress the sidelobe and drop multiple channels.
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